This is not a security hole.
And it has little to do with the language.
This is just how computers work.

This is not a proposition, it's just spam.



________________________________
From: Std-Discussion <std-discussion-bounces_at_[hidden]> on behalf of Amit via Std-Discussion <std-discussion_at_[hidden]>
Sent: Monday, February 17, 2025 10:33:23 AM
To: std-discussion_at_[hidden] <std-discussion_at_[hidden]>
Cc: Amit <amitchoudhary0523_at_[hidden]>
Subject: [std-discussion] C++ language has a big security hole.

C++ language has a big security hole. You can change the values of the
private member variables directly by getting the pointer to the
object. So, private member variables are actually not private, they
are public. Below is the example code:

--------------------------------------------------------------------------------

#include <iostream>

using namespace std;

class MyClass
{

private:
    int i;
    int j;

public:
    MyClass(int a, int b)
    {
        i = a;
        j = b;
    }

    void print_data()
    {
        cout << endl;
        cout << "i = " << i << ", j = " << j;
    }

}; // end of class MyClass

int main(void)
{

    MyClass myobj(1, 4);

    myobj.print_data();

    MyClass *m = &myobj;

    int *i_ptr = (int *)(m);
    int *j_ptr = i_ptr + 1;

    *i_ptr = 10;
    *j_ptr = 20;

    myobj.print_data();

    cout << endl << endl;

    return 0;

} // end of function main()

--------------------------------------------------------------------------------

The output is:

i = 1, j = 4
i = 10, j = 20

So, you see that the values of the private member variables ('i' and
'j') were changed directly by using pointers. So, the 'private'
keyword actually didn't serve its purpose.

Regards,
Amit

--
Std-Discussion mailing list
Std-Discussion_at_[hidden]
https://lists.isocpp.org/mailman/listinfo.cgi/std-discussion